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1 /* | 1 /* |
2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2012 The WebRTC project authors. All Rights Reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 4 * Use of this source code is governed by a BSD-style license |
5 * that can be found in the LICENSE file in the root of the source | 5 * that can be found in the LICENSE file in the root of the source |
6 * tree. An additional intellectual property rights grant can be found | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 | 10 |
11 #include "webrtc/modules/remote_bitrate_estimator/overuse_detector.h" | 11 #include "webrtc/modules/remote_bitrate_estimator/overuse_detector.h" |
12 | 12 |
13 #include <algorithm> | 13 #include <algorithm> |
14 #include <sstream> | |
14 #include <math.h> | 15 #include <math.h> |
15 #include <stdlib.h> | 16 #include <stdlib.h> |
16 | 17 |
18 #include "webrtc/base/checks.h" | |
19 #include "webrtc/base/common.h" | |
17 #include "webrtc/modules/remote_bitrate_estimator/include/bwe_defines.h" | 20 #include "webrtc/modules/remote_bitrate_estimator/include/bwe_defines.h" |
18 #include "webrtc/modules/remote_bitrate_estimator/test/bwe_test_logging.h" | 21 #include "webrtc/modules/remote_bitrate_estimator/test/bwe_test_logging.h" |
19 #include "webrtc/modules/rtp_rtcp/source/rtp_utility.h" | 22 #include "webrtc/modules/rtp_rtcp/source/rtp_utility.h" |
23 #include "webrtc/system_wrappers/interface/field_trial.h" | |
20 #include "webrtc/system_wrappers/interface/trace.h" | 24 #include "webrtc/system_wrappers/interface/trace.h" |
21 | 25 |
22 namespace webrtc { | 26 namespace webrtc { |
23 | 27 |
24 enum { kOverUsingTimeThreshold = 100 }; | 28 const char* kAdaptiveThresholdExperiment = "WebRTC-AdaptiveBweThreshold"; |
29 const char* kEnabledPrefix = "Enabled"; | |
30 const size_t kEnabledPrefixLength = sizeof(kEnabledPrefix) - 1; | |
31 const size_t kMinExperimentLength = kEnabledPrefixLength + 3; | |
32 | |
33 const double kMaxAdaptOffsetMs = 15.0; | |
34 const double kOverUsingTimeThreshold = 10; | |
35 | |
36 bool AdaptiveThresholdExperimentIsEnabled() { | |
37 std::string experiment_string = | |
38 webrtc::field_trial::FindFullName(kAdaptiveThresholdExperiment); | |
39 if (experiment_string.length() < kMinExperimentLength) | |
40 return false; | |
41 return experiment_string.substr(0, kEnabledPrefixLength) == kEnabledPrefix; | |
42 } | |
25 | 43 |
26 OveruseDetector::OveruseDetector(const OverUseDetectorOptions& options) | 44 OveruseDetector::OveruseDetector(const OverUseDetectorOptions& options) |
27 : options_(options), | 45 : in_experiment_(AdaptiveThresholdExperimentIsEnabled()), |
28 threshold_(options_.initial_threshold), | 46 k_up_(0.01), |
47 k_down_(0.00018), | |
48 overusing_time_threshold_(100), | |
49 options_(options), | |
50 threshold_(12.5), | |
51 last_update_ms_(-1), | |
29 prev_offset_(0.0), | 52 prev_offset_(0.0), |
30 time_over_using_(-1), | 53 time_over_using_(-1), |
31 overuse_counter_(0), | 54 overuse_counter_(0), |
32 hypothesis_(kBwNormal) {} | 55 hypothesis_(kBwNormal) { |
56 if (in_experiment_) | |
57 InitializeExperiment(); | |
58 } | |
33 | 59 |
34 OveruseDetector::~OveruseDetector() {} | 60 OveruseDetector::~OveruseDetector() {} |
35 | 61 |
36 BandwidthUsage OveruseDetector::State() const { | 62 BandwidthUsage OveruseDetector::State() const { |
37 return hypothesis_; | 63 return hypothesis_; |
38 } | 64 } |
39 | 65 |
40 | |
41 void OveruseDetector::SetRateControlRegion(RateControlRegion region) { | |
42 switch (region) { | |
43 case kRcMaxUnknown: { | |
44 threshold_ = options_.initial_threshold; | |
45 break; | |
46 } | |
47 case kRcAboveMax: | |
48 case kRcNearMax: { | |
49 threshold_ = options_.initial_threshold / 2; | |
50 break; | |
51 } | |
52 } | |
53 } | |
54 | |
55 BandwidthUsage OveruseDetector::Detect(double offset, | 66 BandwidthUsage OveruseDetector::Detect(double offset, |
56 double ts_delta, | 67 double ts_delta, |
57 int num_of_deltas, | 68 int num_of_deltas, |
58 int64_t now_ms) { | 69 int64_t now_ms) { |
59 if (num_of_deltas < 2) { | 70 if (num_of_deltas < 2) { |
60 return kBwNormal; | 71 return kBwNormal; |
61 } | 72 } |
62 const double prev_offset = prev_offset_; | 73 const double prev_offset = prev_offset_; |
63 prev_offset_ = offset; | 74 prev_offset_ = offset; |
64 const double T = std::min(num_of_deltas, 60) * offset; | 75 const double T = std::min(num_of_deltas, 60) * offset; |
65 BWE_TEST_LOGGING_PLOT(1, "offset", now_ms, T); | 76 BWE_TEST_LOGGING_PLOT(1, "offset", now_ms, T); |
66 BWE_TEST_LOGGING_PLOT(1, "threshold", now_ms, threshold_); | 77 BWE_TEST_LOGGING_PLOT(1, "threshold", now_ms, threshold_); |
67 | |
68 if (T > threshold_) { | 78 if (T > threshold_) { |
69 if (time_over_using_ == -1) { | 79 if (time_over_using_ == -1) { |
70 // Initialize the timer. Assume that we've been | 80 // Initialize the timer. Assume that we've been |
71 // over-using half of the time since the previous | 81 // over-using half of the time since the previous |
72 // sample. | 82 // sample. |
73 time_over_using_ = ts_delta / 2; | 83 time_over_using_ = ts_delta / 2; |
74 } else { | 84 } else { |
75 // Increment timer | 85 // Increment timer |
76 time_over_using_ += ts_delta; | 86 time_over_using_ += ts_delta; |
77 } | 87 } |
78 overuse_counter_++; | 88 overuse_counter_++; |
79 if (time_over_using_ > kOverUsingTimeThreshold | 89 if (time_over_using_ > kOverUsingTimeThreshold |
80 && overuse_counter_ > 1) { | 90 && overuse_counter_ > 1) { |
81 if (offset >= prev_offset) { | 91 if (offset >= prev_offset) { |
82 time_over_using_ = 0; | 92 time_over_using_ = 0; |
83 overuse_counter_ = 0; | 93 overuse_counter_ = 0; |
84 hypothesis_ = kBwOverusing; | 94 hypothesis_ = kBwOverusing; |
85 } | 95 } |
86 } | 96 } |
87 } else if (T < -threshold_) { | 97 } else if (T < -threshold_) { |
88 time_over_using_ = -1; | 98 time_over_using_ = -1; |
89 overuse_counter_ = 0; | 99 overuse_counter_ = 0; |
90 hypothesis_ = kBwUnderusing; | 100 hypothesis_ = kBwUnderusing; |
91 } else { | 101 } else { |
92 time_over_using_ = -1; | 102 time_over_using_ = -1; |
93 overuse_counter_ = 0; | 103 overuse_counter_ = 0; |
94 hypothesis_ = kBwNormal; | 104 hypothesis_ = kBwNormal; |
95 } | 105 } |
106 | |
107 UpdateThreshold(T, now_ms); | |
108 | |
96 return hypothesis_; | 109 return hypothesis_; |
97 } | 110 } |
111 | |
112 void OveruseDetector::UpdateThreshold(double modified_offset, int64_t now_ms) { | |
113 if (!in_experiment_) | |
stefan-webrtc
2015/07/07 08:31:33
I don't want to remove the in_experiment_ flag bec
| |
114 return; | |
115 | |
116 if (last_update_ms_ == -1) | |
117 last_update_ms_ = now_ms; | |
118 | |
119 if (fabs(modified_offset) > threshold_ + kMaxAdaptOffsetMs) { | |
120 // Avoid adapting the threshold to big latency spikes, caused e.g., | |
121 // by a sudden capacity drop. | |
122 last_update_ms_ = now_ms; | |
123 return; | |
124 } | |
125 | |
126 const double k = fabs(modified_offset) < threshold_ ? k_down_ : k_up_; | |
127 threshold_ += | |
128 k * (fabs(modified_offset) - threshold_) * (now_ms - last_update_ms_); | |
129 | |
130 const double kMinThreshold = 6; | |
131 const double kMaxThreshold = 600; | |
132 threshold_ = std::min(std::max(threshold_, kMinThreshold), kMaxThreshold); | |
133 | |
134 last_update_ms_ = now_ms; | |
135 } | |
136 | |
137 // Gets thresholds from the experiment name following the format | |
138 // "WebRTC-AdaptiveBweThreshold/Enabled-0.5,0.002/". | |
139 void OveruseDetector::InitializeExperiment() { | |
140 double k_up = 0.0; | |
141 double k_down = 0.0; | |
142 overusing_time_threshold_ = kOverUsingTimeThreshold; | |
143 if (ReadExperimentConstants(&k_up, &k_down)) { | |
144 k_up_ = k_up; | |
145 k_down_ = k_down; | |
146 } | |
147 } | |
148 | |
149 bool OveruseDetector::ReadExperimentConstants(double* k_up, | |
150 double* k_down) const { | |
151 std::string experiment_string = | |
152 webrtc::field_trial::FindFullName(kAdaptiveThresholdExperiment); | |
153 std::stringstream ss(experiment_string.substr(kEnabledPrefixLength + 1)); | |
154 return sscanf(experiment_string.substr(kEnabledPrefixLength + 1).c_str(), | |
155 "%lf,%lf", k_up, k_down) == 2; | |
156 } | |
98 } // namespace webrtc | 157 } // namespace webrtc |
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